The ST7234x devices are members of the ST7 microcontroller family. All devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set.They feature single-voltage Flash memory with byte-by-byte in-circuit programming (ICP) and in-application programming (IAP) capabilities.Under software control, all devices can be placed in Wait, Slow, Auto-wakeup from Halt, Active-halt or Halt mode, reducing the power consumption when the application is in idle or stand-by state.The enhanced instruction set and addressing modes of the ST7 offer both power and flexibility to software developers, enabling the design of highly efficient and compact application code. In addition to standard 8-bit data management, all ST7 microcontrollers feature true bit manipulation, 8×8 unsigned multiplication and indirect addressing modes.The devices feature an on-chip debug module (DM) to support in-circuit debugging (ICD).
Memories
up to 16 Kbytes Program memory: single voltage extended Flash (XFlash) with read-out and write protection, in-circuit and in-application programming (ICP and IAP). 10,000 write/erase cycles guaranteed, data retention: 20 years at 55 °C.
up to 1 Kbyte RAM
256 bytes data EEPROM with readout protection. 300,000 write/erase cycles guaranteed, data retention: 20 years at 55 °C.
Clock, reset and supply management
Power on / power off safe reset with 3 programmable threshold levels (LVD)
Auxiliary voltage detector (AVD)
Clock sources: crystal/ceramic resonator oscillators, high-accuracy internal RC oscillator or external clock
PLL for 4x or 8x frequency multiplication
5 power-saving modes: Slow, Wait, Halt, Auto-wakeup from Halt and Active-halt
Clock output capability (fCPU)
Interrupt management
Nested interrupt controller
10 interrupt vectors plus TRAP and RESET
9 external interrupt lines on 4 vectors
Up to 34 I/O ports
up to 34 multifunctional bidirectional I/O lines
up to 12 high sink outputs (10 on 32-pin devices)
4 timers
Configurable window watchdog timer
Real-time base
16-bit timer A with: 1 input capture, 1 output compare, external clock input, PWM and pulse generator modes
16-bit timer B with: 2 input captures, 2 output compares, PWM and pulse generator modes
3 communication interfaces
I2C multimaster / slave
I2C slave 3 addresses, no stretch, with DMA access and byte pair coherency on I²C read
SCI asynchronous serial interface (LIN compatible)
SPI synchronous serial interface
1 analog peripheral
10-bit ADC with 12 input channels (8 on 32-pin devices)
Instruction set
8-bit data manipulation
63 basic instructions with illegal opcode detection
17 main addressing modes
8 x 8 unsigned multiply instruction
Development tools
Full hardware/software development package
On-chip debug module
